The Sig Sauer M400 SDI XSeries is a high-performance semi-automatic rifle chambered in .223 Rem / 5.56 NATO, built for reliability, precision, and adaptability. Featuring a 16-inch barrel with a 1-in-7" twist rate, this rifle is optimized for accuracy and stability. The Flat Dark Earth (FDE) finish enhances durability while providing a modern tactical look. Equipped with a Magpul SL stock, this rifle offers an ergonomic and adjustable design for superior handling and control.
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The M400 SDI XSeries is designed with an aluminum M-LOK handguard, allowing for modular accessory attachment while maintaining a lightweight feel. The Sig 2-Stage Matchlite Duo trigger ensures a crisp, consistent pull, improving precision for both competitive and defensive applications.
This rifle features an ambidextrous safety, enhancing usability for both right- and left-handed shooters. The threaded barrel (1/2x28) accommodates suppressors and other muzzle devices, while the Sig Flash Hider Compensator reduces recoil and muzzle rise. The rifle is optics-ready, featuring a flat-top upper receiver, allowing shooters to customize their sighting system to their preference.
Sig Sauer M400 SDI XSeries Specifications
Caliber: .223 Rem | 5.56 NATO
Action: Semi-Auto
Barrel Length: 16"
Overall Length: 36.5"
Twist Rate: 1-in-7"
Capacity: 30+1 Rounds
Magazine: 1 x 30-Round Polymer Mag
Finish: Flat Dark Earth
Stock: Collapsible / Folding (Magpul SL)
Sights: None (Optics Ready)
Muzzle Device: Sig Flash Hider Compensator
Thread Pattern: 1/2x28
Safety: Ambidextrous
Handguard: Aluminum M-LOK
Trigger: Sig 2-Stage Matchlite Duo
Weight: 7 lbs.
More Information
Barrel Length
16
Caliber
5.56
Capacity
30
Condition
New in Box
Finish Per Color
Flat Dark Earth
Manufacturer
Sig Sauer
Manufacturer Part Number
RM400-SDI-16B-FDE
Model
M400 SDI XSeries
Type
Modern Sporting Rifles
UPC
798681714469
WARNING: This product can expose you to chemicals including arsenic, which is known to the State of California to cause cancer. For more information, go to WWW.P65WARNINGS.CA.GOV
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